p0133 slow oxygen circuit response

gh0st · 07-31-2019, 09:39 AM

A little backstory on what's happened so far... I have a e90 n55 with a JB4, catless downpipe, catless exhaust, and intake and decided I wanted a change so I had a friend with tuning software write a stage 2 tune on the DME and I removed the JB4. For the first few days the car ran great, I had the extra power and it was a thrill. Soon after, I received a P0133 fault which is 02 sensor slow circuit response on bank 1 sensor 1.

I cleared the code and continued on. It came back. So I had my friend flash the DME back to stock and ran the car again for a few days. The code came back again. Next, I had the mechanic replace the O2 sensor on Bank 1 Sensor 1. At this point, the car does not have the JB4 or a DME flash tune however I just received the CEL for the same fault.

Also, I had my muffler shop remove the secondary cats a few days ago and they did not mentioned any leaks in the exhaust. When car is idling with the hood up, I also do not hear any hissing or leaking sounds on the intake. Just not sure where to go next. Could it be the downpipe?

DiFFv1 · 07-31-2019, 11:51 AM

Hmm... Weird, I know that Codes means that there is a slow response or signal on bank 1. can the actually port be the problem? have you inspected it for bent pins or dirt/damage?

weehe126 · 07-31-2019, 01:48 PM

Only other thing to check is the wiring where the sensor plugs into, back to the DME under the intake manifold.

f87CSdrifterential · 08-04-2019, 07:00 AM

Do you have an O2 simulator/fix installed? I had an a r e a 7 4 on my 2011 N55 with a JB4 and when I really got on it the simulator couldn't keep up and gave a slow response code.

07-31-2019, 09:39 AM	#1
gh0st New Member 0 Rep 5 Posts Drives: 2011 BMW 335xi Join Date: Jul 2019 Location: Canada iTrader: (0)	p0133 slow oxygen circuit response A little backstory on what's happened so far... I have a e90 n55 with a JB4, catless downpipe, catless exhaust, and intake and decided I wanted a change so I had a friend with tuning software write a stage 2 tune on the DME and I removed the JB4. For the first few days the car ran great, I had the extra power and it was a thrill. Soon after, I received a P0133 fault which is 02 sensor slow circuit response on bank 1 sensor 1. I cleared the code and continued on. It came back. So I had my friend flash the DME back to stock and ran the car again for a few days. The code came back again. Next, I had the mechanic replace the O2 sensor on Bank 1 Sensor 1. At this point, the car does not have the JB4 or a DME flash tune however I just received the CEL for the same fault. Also, I had my muffler shop remove the secondary cats a few days ago and they did not mentioned any leaks in the exhaust. When car is idling with the hood up, I also do not hear any hissing or leaking sounds on the intake. Just not sure where to go next. Could it be the downpipe?
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07-31-2019, 11:51 AM	#2
DiFFv1 Captain 90 Rep 627 Posts Drives: 335i l 328xi l X5M Join Date: Nov 2018 Location: Hell's Kitchen iTrader: (0)	Hmm... Weird, I know that Codes means that there is a slow response or signal on bank 1. can the actually port be the problem? have you inspected it for bent pins or dirt/damage? __________________ "Proud Waitress At Gapplebees"
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07-31-2019, 01:48 PM	#3
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Only other thing to check is the wiring where the sensor plugs into, back to the DME under the intake manifold.
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08-04-2019, 07:00 AM	#4
f87CSdrifterential First Lieutenant 188 Rep 327 Posts Drives: 2020 M2 CS Join Date: Apr 2015 Location: NH iTrader: (4)	Do you have an O2 simulator/fix installed? I had an a r e a 7 4 on my 2011 N55 with a JB4 and when I really got on it the simulator couldn't keep up and gave a slow response code.
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